feat: Adds Flagsmith example

flags-sdk/flagsmith/.eslintrc.json

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+{
+  "root": true,
+  "extends": "next/core-web-vitals",
+  "rules": {
+    "@typescript-eslint/require-await": "off",
+    "@typescript-eslint/no-misused-promises": "off",
+    "import/order": "off",
+    "camelcase": "off",
+    "no-console": "off"
+  }
+}

flags-sdk/flagsmith/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+.yarn/install-state.gz
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

flags-sdk/flagsmith/README.md

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+# flagsmith Flags SDK Example
+
+This example uses [flagsmith](https://flagsmith.com/) for feature flags with the [Flags SDK](https://flags-sdk.dev) and the [Flags SDK flagsmith adapter](https://flags-sdk.dev/docs/api-reference/adapters/flagsmith) along with the [Flags Explorer](https://vercel.com/docs/workflow-collaboration/feature-flags/using-vercel-toolbar).
+
+## Demo
+
+[https://flags-sdk-flagsmith.vercel.app/](https://flags-sdk-flagsmith.vercel.app/)
+
+## How it works
+
+This demo uses two feature flags defined in code control the visibility of two banners on the page.
+Both flags are configured to show/hide each banner 50% of the time.
+
+Once you visit the page, you can see a variation of both/one/none of the banners.
+Since this example is using a stable id to identify users, you will see the same variation until you reset your id.
+
+To test different variations, you can use the Dev Tools at the bottom to reset the stable id and reload the page.
+This allows you to test different variations of the banners.
+
+If you deployed your own instance of this example you can also use the [Flags Explorer](https://vercel.com/docs/workflow-collaboration/feature-flags/using-vercel-toolbar) to test different variations by creating overrides.
+
+## Deploy this template
+
+[![Deploy with Vercel](https://vercel.com/button)](https://vercel.com/new/clone?repository-url=https%3A%2F%2Fgithub.com%2Fvercel%2Fexamples%2Ftree%2Fmain%2Fflags-sdk%2Fflagsmith&env=FLAGS_SECRET&envDescription=The+FLAGS_SECRET+will+be+used+by+the+Flags+Explorer+to+securely+overwrite+feature+flags.+Must+be+32+random+bytes%2C+base64-encoded.+Use+the+generated+value+or+set+your+own.&envLink=https%3A%2F%2Fvercel.com%2Fdocs%2Fworkflow-collaboration%2Ffeature-flags%2Fsupporting-feature-flags%23flags_secret-environment-variable&project-name=flagsmith-flags-sdk-example&repository-name=flagsmith-flags-sdk-example)
+
+### Step 1: Link the project
+
+First, install the latest version of the Vercel CLI:
+
+```bash
+pnpm i -g vercel
+```
+
+or
+
+```bash
+npm i -g vercel
+```
+
+To use the Flags Explorer, you need to connect your local project to your Vercel project:
+
+```bash
+vercel link
+```
+
+Select the project from the list you just deployed.
+
+### Step 2: Pull all environment variables
+
+This allows the Flags SDK and the Flags Explorer to work correctly, by getting additional metadata.
+
+```bash
+vercel env pull
+```
+
+Step 3: Create Feature Flags
+Head over to Flagsmith dashboard and create the feature flags required by this template.
+
+Feature Flags:
+
+Summer Sale with the key summer-sale
+Free Shipping with the key free-delivery
+Proceed To Checkout with the key proceed-to-checkout-color
+You can also find the feature flag keys in the flags.ts file.
+
+Set both feature flags to rollout to 50% of users.

flags-sdk/flagsmith/app/.well-known/vercel/flags/route.ts

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+import { createFlagsDiscoveryEndpoint, getProviderData } from 'flags/next'
+import * as flags from '../../../../flags'
+
+export const dynamic = 'force-dynamic' // defaults to auto
+
+export const GET = createFlagsDiscoveryEndpoint(() => getProviderData(flags))

flags-sdk/flagsmith/app/[code]/add-to-cart.tsx

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+'use client'
+
+import { track } from '@vercel/analytics'
+import { useEffect, useState } from 'react'
+import { useRouter } from 'next/navigation'
+import { addToCart } from '@/lib/actions'
+import { useProductDetailPageContext } from '@/components/utils/product-detail-page-context'
+import { AddToCartButton } from '@/components/product-detail-page/add-to-cart-button'
+
+export function AddToCart() {
+  const router = useRouter()
+  const { color, size } = useProductDetailPageContext()
+  const [isLoading, setIsLoading] = useState(false)
+
+  useEffect(() => {
+    track('add_to_cart:viewed')
+  }, [])
+
+  return (
+    <AddToCartButton
+      isLoading={isLoading}
+      onClick={async () => {
+        setIsLoading(true)
+        track('add_to_cart:clicked')
+        await addToCart({ id: 'shirt', color, size, quantity: 1 })
+        router.push('/cart')
+      }}
+    />
+  )
+}

flags-sdk/flagsmith/app/[code]/cart/order-summary.tsx

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+import { proceedToCheckoutColorFlag } from '@/flags'
+import { OrderSummarySection } from '@/components/shopping-cart/order-summary-section'
+import { ProceedToCheckout } from './proceed-to-checkout'
+
+export async function OrderSummary({
+  showSummerBanner,
+  freeDelivery,
+}: {
+  showSummerBanner: boolean
+  freeDelivery: boolean
+}) {
+  // This is a fast feature flag so we don't suspend on it
+  const proceedToCheckoutColor = await proceedToCheckoutColorFlag()
+
+  return (
+    <OrderSummarySection
+      showSummerBanner={showSummerBanner}
+      freeDelivery={freeDelivery}
+      proceedToCheckout={<ProceedToCheckout color={proceedToCheckoutColor} />}
+    />
+  )
+}

flags-sdk/flagsmith/app/[code]/cart/page.tsx

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+import { OrderSummary } from '@/app/[code]/cart/order-summary'
+import { Main } from '@/components/main'
+import { ShoppingCart } from '@/components/shopping-cart/shopping-cart'
+import {
+  productFlags,
+  showFreeDeliveryBannerFlag,
+  showSummerBannerFlag,
+} from '@/flags'
+
+export default async function CartPage({
+  params,
+}: {
+  params: Promise<{ code: string }>
+}) {
+  const { code } = await params
+  const showSummerBanner = await showSummerBannerFlag(code, productFlags)
+  const freeDeliveryBanner = await showFreeDeliveryBannerFlag(
+    code,
+    productFlags
+  )
+
+  return (
+    <Main>
+      <div className="lg:grid lg:grid-cols-12 lg:items-start lg:gap-x-12 xl:gap-x-16">
+        <ShoppingCart />
+        <OrderSummary
+          showSummerBanner={showSummerBanner}
+          freeDelivery={freeDeliveryBanner}
+        />
+      </div>
+    </Main>
+  )
+}

flags-sdk/flagsmith/app/[code]/cart/proceed-to-checkout.tsx

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+'use client'
+
+import { ProceedToCheckoutButton } from '@/components/shopping-cart/proceed-to-checkout-button'
+import { track } from '@vercel/analytics'
+import { toast } from 'sonner'
+
+export function ProceedToCheckout({ color }: { color: string }) {
+  return (
+    <ProceedToCheckoutButton
+      color={color}
+      onClick={() => {
+        track('proceed_to_checkout:clicked')
+        toast('End reached', {
+          className: 'my-classname',
+          description: 'The checkout flow is not implemented in this template.',
+          duration: 5000,
+        })
+      }}
+    />
+  )
+}

flags-sdk/flagsmith/app/[code]/layout.tsx

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+import { deserialize, generatePermutations } from 'flags/next'
+import { FlagValues } from 'flags/react'
+import { productFlags, showFreeDeliveryBannerFlag } from '@/flags'
+import { FreeDelivery } from '@/app/free-delivery'
+import { DevTools } from '@/components/dev-tools'
+import { Footer } from '@/components/footer'
+import { Navigation } from '@/components/navigation'
+
+export async function generateStaticParams() {
+  // Returning an empty array here is important as it enables ISR, so
+  // the various combinations stay cached after they first time they were rendered.
+  //
+  // return [];
+
+  // Instead of returning an empty array you could also call generatePermutations
+  // to generate the permutations upfront.
+  const codes = await generatePermutations(productFlags)
+  return codes.map((code) => ({ code }))
+}
+
+export default async function Layout(props: {
+  children: React.ReactNode
+  params: Promise<{
+    code: string
+  }>
+}) {
+  const params = await props.params
+  const values = await deserialize(productFlags, params.code)
+
+  const showFreeDeliveryBanner = await showFreeDeliveryBannerFlag(
+    params.code,
+    productFlags
+  )
+
+  return (
+    <div className="bg-white">
+      <FreeDelivery show={showFreeDeliveryBanner} />
+      <Navigation />
+      {props.children}
+      <FlagValues values={values} />
+      <Footer />
+      <DevTools />
+    </div>
+  )
+}

flags-sdk/flagsmith/app/[code]/page.tsx

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+import { SummerSale } from '@/app/summer-sale'
+import { ImageGallery } from '@/components/image-gallery'
+import { ProductDetails } from '@/components/product-detail-page/product-details'
+import { ProductHeader } from '@/components/product-detail-page/product-header'
+import { AddToCart } from '@/app/[code]/add-to-cart'
+import { ColorPicker } from '@/components/product-detail-page/color-picker'
+import { SizePicker } from '@/components/product-detail-page/size-picker'
+import { ProductDetailPageProvider } from '@/components/utils/product-detail-page-context'
+
+import { productFlags, showSummerBannerFlag } from '@/flags'
+import { Main } from '@/components/main'
+
+export default async function Page(props: {
+  params: Promise<{ code: string }>
+}) {
+  const params = await props.params
+
+  const showSummerBanner = await showSummerBannerFlag(params.code, productFlags)
+
+  return (
+    <ProductDetailPageProvider>
+      <SummerSale show={showSummerBanner} />
+      <Main>
+        <div className="lg:grid lg:auto-rows-min lg:grid-cols-12 lg:gap-x-8">
+          <ProductHeader />
+          <ImageGallery />
+
+          <div className="mt-8 lg:col-span-5">
+            <ColorPicker />
+            <SizePicker />
+            <AddToCart />
+            <ProductDetails />
+          </div>
+        </div>
+      </Main>
+    </ProductDetailPageProvider>
+  )
+}

flags-sdk/flagsmith/app/free-delivery.tsx

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+'use client'
+
+import { FreeDeliveryBanner } from '@/components/banners/free-delivery-banner'
+import { track } from '@vercel/analytics'
+import { useEffect } from 'react'
+
+export function FreeDelivery(props: { show: boolean }) {
+  useEffect(() => {
+    if (props.show) track('free_delivery_banner:viewed')
+  }, [props.show])
+
+  if (!props.show) return null
+
+  return <FreeDeliveryBanner />
+}

flags-sdk/flagsmith/app/globals.css

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+@import 'tailwindcss';
+
+@custom-variant dark (&:is(.dark *));
+
+@theme {
+  --color-link: rgb(0 112 243 / 1);
+  --color-success: rgb(0 112 243 / 1);
+  --color-background: white;
+  --color-success-dark: rgb(7 97 209 / 1);
+}

flags-sdk/flagsmith/app/layout.tsx

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+import { VercelToolbar } from '@vercel/toolbar/next'
+import { Analytics } from '@vercel/analytics/next'
+import type { Metadata } from 'next'
+import { Toaster } from 'sonner'
+
+import './globals.css'
+import { ExamplesBanner } from '@/components/banners/examples-banner'
+
+export const metadata: Metadata = {
+  title: 'Flags SDK Example',
+  description: 'A Flags SDK example for Ecommerce',
+}
+
+export default function RootLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode
+}>) {
+  return (
+    <html lang="en">
+      <body className="antialiased">
+        <ExamplesBanner />
+        {children}
+        <Toaster />
+        <Analytics />
+        <VercelToolbar />
+      </body>
+    </html>
+  )
+}